Javascript Drop-Down Select Menu

We are in need of someone to add a bit of javascript that will check a set of 'State' checkboxes when a certain <select> option is chosen. There are three groups - one for each <option> - and when selected from the drop-down will then check off the states associated with that group per the XLS sheet that is attached. You can see in the attached screen shot the list of states/checkboxes that exists, and we would need the <select> drop-down added above this section.

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This Project is depend on java script technology and requirement is Drop Down Selected Menu.
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